Answer:
a)
, b)
, c)
, d)
, e) 
Explanation:
a) The coefficient of performance of the reversible refrigeration cycle is:


The temperature of the hot reservoir is:



b) The coefficient of performance is:


c) The temperature of the hot reservoir can be determined with the help of the following relation:






d) The coefficient of performance is:


e) The temperature of the cold reservoir is:




Answer: Steel is an alloy of iron with typically a few percent of carbon to improve its strength and fracture resistance compared to iron. Many other additional elements may be present or added. Stainless steels that are corrosion and oxidation resistant need typically an additional 11% chromium.
Explanation:
Answer:
4 times around
Explanation:
The total number of teeth involved will be the same for each gear. If the front gear is connected to the pedal and it goes around twice, then 2·24 = 48 teeth will have passed the reference point.
If the rear gear is attached to the wheel, and 48 teeth pass the reference point, then it will have made ...
(48 teeth)/(12 teeth/turn) = 4 turns